ul {
  padding: 0;
  margin: 0;
  list-style: none;
}

a {
  text-decoration: none;
}

.menu-wrap {
  width: 200px;
  height: 440px;
  background-color: #424242;
  margin: 50px;
}

.menu-wrap .main {
  height: 100%;
}

.menu-wrap .main .main-item {
  height: 44px;
}

.menu-wrap .main .main-item a {
  display: block;
  height: 100%;
  text-align: center;
  line-height: 44px;
  color: #fff;
}
.menu-wrap .main .main-item.active a {
  background-color: #666;
  color: orange;
}

.menu-wrap .sub {
  position: absolute;
  top: 50px;
  left: 258px;
  width: 440px;
  height: 440px;
  background-color: #eee;
}

.menu-wrap .sub.hide {
  display: none;
}

.menu-wrap .sub .sub-list {
  position: relative;
}

.menu-wrap .sub .sub-item {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  text-align: center;
  line-height: 440px;
  font-size: 50px;
}

.menu-wrap .sub .sub-item.active {
  display: block;
}
